If you have a way of keeping the purees tasting "fresh" without the help of a fridge, I think purees would be fine. If not, you can get one of those baby foods from the store, the ones in the little jars. That's very common with my friends. I also know a mom who brings fresh bananas with her and simply mash them with a fork and that becomes baby's snack for the day. But of course, breastmilk is convenient if you have no qualms breastfeeding in publlic or have access to spaces to nurse :)
As for me, I will not do fruit puree for that day. Fruits oxidize faster so will turn sourish fast. I brought baby cereal and then warm up either bm or FM to mix with it. As they are still young, I prefer to give them fresh food. You can choose to bf the whole day if it is more convenient for you.
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I bring out baby food in the jar/pouch when out for the whole day. You can also use an insulated thermos like this
Bring out food in this cute jar from skip hop that can keep food warm for 6-8hours.
Darius Cheung